Can you help me with original pronounciation of Clara?

Hey everyone,
I'm loving Clara (Claire-uh), and I understand everyone has their preferred pronounciations, but is there anywhere that I can find out the original pronounciation?
All I have found is that it is a variant of Clare and a nickname for Clarissa.
It seems to me that that Claire-uh would come from Clare and klah-rah would come from Clarissa, but I would like to know for sure if there is an original pronounciation and from which country?
Can anyone help?